SHORT-TERM AND LONG-TERM INVESTMENTS

3 Months Ended

Jan. 31, 2017

Investments, Debt and Equity Securities [Abstract]

SHORT-TERM AND LONG-TERM INVESTMENTS

SHORT-TERM AND LONG-TERM INVESTMENTS

As of the dates indicated, investments are comprised of the following (in thousands):

	January 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government obligations:
Included in short-term investments	$	230,090	$	60	(46		)	$	230,104
Included in long-term investments	110,035		5		(106		)	109,934
	$	340,125	$	65	$	(152	)	$	340,038
Commercial paper:
Included in short-term investments	$	19,952	—		—			$	19,952
	$	19,952	$	—	$	—		$	19,952

	October 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government obligations:
Included in short-term investments	$	260,125	$	140	$	(6	)	$	260,259
Included in long-term investments	90,145		57		(30		)	90,172
	$	350,270	$	197	$	(36	)	$	350,431
Commercial paper:
Included in short-term investments	$	14,989	—		—			$	14,989
	$	14,989	$	—	$	—		$	14,989

The following table summarizes the final legal maturities of debt investments at January 31, 2017 (in thousands):

	Amortized Cost		Estimated Fair Value
Less than one year	$	250,042	$	250,056
Due in 1-2 years	110,035		109,934
	$	360,077	$	359,990